Reverse-phase safety-relay for motor-circuits.



O. H. SPANGLER. RBVERSEAPHASE'SAFETY RELAY FOR MOTOR CIRCUITS.

APPLICATION I EEEEEEEEEEEEE 3.

I 1,1 12,863. Patented 0011.6, 1914.

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M Nlllililtiv "unearth: n. qsraue'n En, or nnanrns, PENNS LVANIA.

mu s SAFETY-RELAY non MoTOR-CIBCUITS.

To all wko-mv it mag concern Be it knownthat 1,? CHARLES H. SPANGLER; A

a citizen of the United States, residing at thecity of Reading, the county of Berks and State of Pennsylvania, have invented certain new and useful Improvements in Reverse-Phase Safety-Relays for Motor-Cir cuits, of which the following is a spec1fica-' "tio'n;

Myinvention relates to means for protecting polyphase 'motor-driven elevators and like machinery from damage due to accidental reversal of phase; and it consists in the improved device fully described'in connection with the accompanying drawings,

- the-novel features of which are'specifically pointed out in the claims. o

..The invention is particularly applicable to polyphase alternating-current motor circuits containing an overload'circuit breaker, in

connection with which it is illustrated in the accompanying drawings; and is embodied in Figure l is an elevation showing my com-- plete' device in preferred form and in operating'connection with the line wires and circuit breaker the disk-segment being 1 shown in normal operating position, but its reverse phase position being also indicated by dotted lines. Fig. 2 is an elevation taken at right angles to Fig. 1. Fig. 3 indicates a modified operating connection between the disksegment and the circuit breaker.

As shown, the disk-segment or air-gapped disk 2, of aluminum or like conductive but non-magnetic material, is fixed to a central pivot shaft 3 mounted in a suitable fixed bearing 4, so as to swing between th ad acent legs 5 5 6 6'". of two similar magnetic cores 5 and 6. The separate energizing coils '7, 7, for these cores, are connected in delta across'tl1ree-pl1ase to the line wires 10,

. 11, 12, as indicated in Fig. 1'; so that the fluxes produced in the cores 5,6 by the normal phase relation through the coils, will cause the disk-segment 2 to be swung to the position indicated in full 1ines,'the extent ct this turning movement being limited as indi- Sp ecification of Letters Patent. Application filed-June 4.1913. 7 Serial No. 771,608;

sir-segment which is actuated by two I Patented Oct. 6, 1914.

cated, by a-radial. boundary line 2 of the segment.

If the disk-segment 2 were a complete disk the torque of-the magnetic cores 5 5 andv 6* 6, which repel in the samcdirection, would continually rotate the disk, but by having the air gap shown, between, the boundary lines 2 and 2 this rotation is limited. It

requires the combined action of both cores 5- and 6 to turn the disk, and in the position indicated in Fig. 1, whichis the normal phase operation, the boundary line 2 has reached a point at which the torque of core piece 5 and 5 no longer acts, the flux passing through without repellent action on the disk 2. In the reverse phase the line 2 limits its turning in like manner.-

Then a reversal of phase occurs from any cause, and the changed flow of current through the coils 7. '7 causes the disk segment 2 to promptly swing to the dotted position indicated in Fig. 1, such movement is ar-' ranged to automatically operate the main line circuit breaker indicated at 20, so as to Y shut off all flow of current until the cause of such reversal has been found and remedied.

This is directly efiected, as indicated in Fig. l, by, means of an electro-magnet 21 contained in an independent circuit whichv is normallyheld open by a spring contact arm The end 23 of this armnormally bears upon a collar 2st of the disk shaft 3 so as to hold it clear of a fixed contact 25; but as soon as the disk is swung to the dotted position indicated in Fig. 1 because ofa reversal of phase, said end 23 of the spring contact arm falls into a recess 260i the collar 2-l, and closes the independent circuit so as to energize the magnet .21 and open the circuit breaker, 20. I

My improved apparatus is very simple and inexpensive in construction and application. and may insome cases be advantageouslv mounted on the circuit breaker indicated in, Fig. 3, a difierent operating connection is employed between the disk and the Ecircuit breaker. consisting simply ofa trip rod 30 for the latter which is mechanically operatedby the swing of the disk through a crankconnection 31 to said disk.

What l'claim is: i T

1. In combination with a multi-phase alternating current motor circuit,a pair of magnetic cores, an air-gapped non-magnetic disk pivotally supported between said cores and-rocked on 'itspivot by the combined action of said cores, said rocking "nio-ven ent being limited in; either direction by the boundary-lines of said air gap. 2. In combination with a inulti-phase alternating current motor circuit containing a circuit breaker and a pair 'of magnetic cores, an air gapped nonanagnetic disk pivotally supported between said cores and rockable in one'direction by the normal phase relation in the motorcircuit, and in the reverse direction by achange of phase relation in said circuit, and breaker opening means operated by saidreverse, swing of the disk.

3' In combination with a multi-phase alternating current motor circuit containing a a circuit breaker; a reverse phase operating devicefor said breaker comprising two magneti cores having separate energizing coils 1n delta connection with the line wires, an

air gapped disk arranged to be swung in one direction by the combined action of the fluxes produced 1n said cores b operating connections between said disk and circuit breaker whereby the latter is opened inpresence of two witnesses.

CHARLES H; SPANGLERQ Witnesses ADAM L. OTTERBEIN,

W'. G. STEWART.

a normal I phase relation in said 0011s and in the other direction when the phases are reversed, and 

